If you are using the OS 46AX on a typical trainer, it doesn't make much sense to fly at full throttle, anyway. It's way too much power for training purposes. Most rationale for that engine on a trainer is so that you will have it for the "next" plane, whatever that may be. In short, learn throttle control. That engine should easily take off most trainers at 1/2 throttle, and come down from that when you are flying. Or just bolt on a 9X6 and have at it.